At the Marine Corps Marathon, when you get to the 13.1 mile point, you are likely to wonder what your finish time might be. At MCM, for the average runner, here's the approximate formula: half marathon time x 2.2 = full marathon time.

Example, if you're M30-34, and you've run a 2:03 half marathon, your finish time is likely to be 4:28. With an R-squared of .83, confidence in this prediction is fairly high. For more MCM stats and FAQ, see our Complete Marine Corps Marathon Coverage.